Increasing HFile block size

Question

I have a key-value pair size of l00 bytes. What happens if I increase HFile block size from its default 64k.

Answer 1

If you increase the block size then your scan throughput increases and random-access latency decreases.
Generally, larger block size is preferred if files are primarily for sequential access. Smaller blocks are good for random access, but require more memory to hold the block index, and may be slower to create.

Hope this helps.